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Hide the closest div with a specific ID using Jquery

I am trying to hide a closest div with specific ID but its not working for me
Here is what I have tried.
HTML
<div style="width:50px; height:20px; background-color:green" id="myblock">other content</div>
<div>
<div style="width:50px; height:100px; background-color:yellow" id="dialog-box">content to hide</div>
<div> <a href="#" onclick="hideclosest(this);">
<span> Hide closest Div </span>
</a>
</div>
Script
function hideclosest(ctrl) {
$(ctrl).closest("#dialog-box").hide();
}
Here is Fiddle
http://jsfiddle.net/c2ewk44o/2/

Id should be unique on a page, therefore:
$("#dialog-box").hide();
will simply work for you. If you dont have unique id, then you have to convert them into classes or give all the elements unique id

Try to traverse properly. #dialog-box is not a closest element to that button. By the way it is an id, so you can select it directly with an id selector. But if you want to select it with some other means use the below code,
function hideclosest(ctrl){
$(ctrl).parent().prev("#dialog-box").hide();
}
DEMO

You meant something like:
function hideclosest(ctrl)
{
$(ctrl).closest("div").prev().hide();
}
or like:
function hideclosest(ctrl)
{
$(ctrl).parent().prev().hide();
}

To hide the closet div use that code
$(ctrl).prev("#dialog-box").hide();
Hope solve your problem.

jQuery function on different Elements

So, I have a simple code that I can't get it to work. I tried to find answers on the same topic here, but being new to jQuery all answers seem too complicated.
Anyways, what I want to do is have the same script run for different divs. After some reading here I managed to arrange the following code, but it doesn't seem to work.
<div id="mydiv1" onclick="handleClick(this)" style="position:relative; left:0px;">Div One</div>
<div id="mydiv1a" style="position:relative; left:0px;">Div One A</div>
<div id="mydiv2" onclick="handleClick(this)" style="position:relative; left:0px;">Div Two</div>
<div id="mydiv2a" style="position:relative; left:0px;">Div Two A</div>
<script>
$(document).ready(function(){
function handleClick(x) {
$(x.id + 'a').fadeToggle("slow");
}
}
</script>
What I want this to do is when I click #mydiv1, the function should run on #mydiv1a. And the same for #mydiv2. Thank you in advance for your help!

It's better to assign the handling within your script (not inline in html). Bonus for that is that you can use jQuery delegation, i.e. assign a click handler on the document body for a number of elements within the body. Furthermore, the styling should be in a css tag/css file where possible (why?). In this case both position and left are useless. The snippet shows all this:
$('body').on('click', '#mydiv1, #mydiv2', handleClick);
// ^ handler on body | |
// for elements |
// handler method
function handleClick(e) {
$('#'+this.id+'a').fadeToggle('slow');
}
#mydiv1, #mydiv2 {
cursor: pointer;
}
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js">
</script>
<div id="mydiv1">Div One</div>
<div id="mydiv1a">Div One A</div>
<div id="mydiv2">Div Two</div>
<div id="mydiv2a">Div Two A</div>

You need to use # which is how you select element with a specific id in jQuery or css for that matter
$('#' + x.id + 'a').fadeToggle("slow");
But you can simplify your code to the below
$('div').filter(function(){ return /\d+$/.test(this.id) }).click(function(){
$(this).next().fadeToggle("slow");
});

Try this
$(this).next().fadeToggle("slow");

This code creates a click event for both divs. The event will be aware of the specific div clicked.
$(function(){
$("#mydiv1, #mydiv2").click(function(){
$(this).fadeToggle("slow");
});
});

Use the same JavaScript code for different divs

This is my JavaScript code:
Javascript
<script> $(document).ready(function(){
$("#showButton").click(function(){ $("#showContent").toggle("slow");
}); }); </script>
The question is how I can use same code for different <div>
Like using this code to open <div id=#showContent></div> and using same code but separately open <div id=#showContentSecond></div>
I have a lot of div elements and I don't want to code something everytime I want to manipulate an element.

The button will need to be related to the div in some way, if it isn't a child of the div, example:
<button class="mybutton" data-something="1">One</button>
<button class="mybutton" data-something="2">Two</button>
<div data-something="1">first</div>
<div data-something="2">second</div>
Javascript:
$(document).ready(function(){
$('button.mybutton').click(function(){
$('div[data-something=' + $(this).data('something') + ']').toggle();
});
});
Fiddle demo: http://jsfiddle.net/vcAtb/

You can use the document.getElementsByTagName element to get all divs.
document.getElementsByTagName("div")

Apply a CSS class to each element you want to have the same behavior
HTML
<div id="div1" class="toggleDiv"></div>
<div id="div2" class="toggleDiv"></div>
<div id="div3" class="toggleDiv"></div>
JavaScript
$(document).ready(function(){
$(".toggleDiv").click(function()
{
$(this).toggle("slow");
});
});
http://jsfiddle.net/gDG6n/

How to use jQuery slideDown() to display _almost_ all contents?

I have a div within a div. On page load, they should both be hidden, then when I trigger the slideDown() function on the outer div, I want the inner div to remain hidden. How can I achieve this?
<script>
$(function(){
$('.body').hide();
$('.display').click(function(){
$(this).closest('.wrapper').find('.body').slideDown();
});
});
</script>
<div class="wrapper">
<a class="display" href="#">Display Outer</a>
<div class="body">
Now displaying outer div
<div class="wrapper">
<a class="display" href="#">Display Inner</a>
<div class="body">
Now displaying inner div
</div>
</div>
</div>
</div>
Here is an example of it not working: http://jsfiddle.net/b7Tpt/

The reason it doesn't work is the use of find. find would traverse all levels to find the matches while the children would travel single level. So use find('.body:first') or children('.body')
$(function(){
$('.body').hide();
$('.display').click(function(){
$(this).closest('.wrapper').find('.body:first').slideDown();
});
});
Updated Example
OR
$(function(){
$('.body').hide();
$('.display').click(function(){
$(this).closest('.wrapper').children('.body').slideDown();
});
});
Updated Example

Try -
$('.display').click(function(){
$(this).siblings('.body').slideDown();
});
I think $(this).closest('.wrapper') was moving up the DOM tree and finding the top most wrapper div then opening all the body classes it found underneath. Using siblings should get the element with a body class that is directly beneath the clicked link.
Demo - http://jsfiddle.net/pMgVj/1/

try this: http://jsfiddle.net/Kf6gk/

JQuery closest() help

So I have several containers with this markup on a page:
<div class="box w400">
<div class="box-header">
<span class="expand-collapse">expand/collapse</span>
<h3>Heading</h3>
</div>
<div class="box-content">
<p>Some content here...</p>
</div>
</div>
And I am trying to achieve that after clicking on the .expand-collapse span, the .box-content div will slide up or down (toggle).
Here is the jQuery I'm using, I am trying to achieve this with closest():
$(document).ready(function() {
$('.expand-collapse').click(function() {
$(this).closest('.box-content').slideToggle('slow');
});
});
But it is not working for some reason :(

Try this:
$(document).ready(function() {
$('.expand-collapse').click(function() {
$(this).parent().next('.box-content').slideToggle('slow');
});
});
That selects the next sibling of the parent div, it does not make use of closest.

closest() finds the closes parent element. In your case, the span doesn't have any parent elements with class .box-content. why not just do $('.box-content').slideToggle('slow'); ??
edit: i missed the part where you have several of these on a page. the parent().next should work.